CN110061500A - A kind of fast evaluation method and system of power distribution network power supply capacity - Google Patents
A kind of fast evaluation method and system of power distribution network power supply capacity Download PDFInfo
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- CN110061500A CN110061500A CN201910482058.7A CN201910482058A CN110061500A CN 110061500 A CN110061500 A CN 110061500A CN 201910482058 A CN201910482058 A CN 201910482058A CN 110061500 A CN110061500 A CN 110061500A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a kind of fast evaluation method of power distribution network power supply capacity, method is the following steps are included: S1, the maximum transfer capacity for obtaining feeder line and main transformer, the connection relationship between feeder line and the connection relationship between main transformer；S2, according to the connection relationship between the feeder line of acquisition, determine that at least one feeder line turns supply path；According to the connection relationship between the main transformer of acquisition, determine that at least one main transformer turns supply path；Turn supply path according to feeder line and main transformer turns supply path, establishes feeder line and turn for electric matrix；S3, turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and feeder line, establish main transformer and turn for electric matrix；S4, the main transformer overload verification carried out under the conditions of main transformer N-1 calculate power distribution network net capability according to maximum permissible load if verification passes through；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, until verification passes through.It is high that this method calculates the power distribution network net capability result accuracy obtained.
Description
Technical field
The present invention relates to the fast of distribution network planning and running technology field field more particularly to a kind of power distribution network power supply capacity
Fast appraisal procedure and system.
Background technique
During the upgrading of power distribution network, a crucial task is accurately to calculate and assess the maximum of power distribution network to supply
Electric energy power (Total Supply Capability, TSC), to provide operable confession for distribution network planning, design and operation
Capacitance guidance.Power distribution network net capability refers to that in certain power supply area, power distribution network is meeting the various operations of system about
Peak load deliverability under the conditions of beam.An important finger of the power distribution network TSC as assessment distribution system limit power supply capacity
The problem of marking, can be not only used for the power supply capacity for analyzing existing Distribution Network Frame, find existing power supply structure and corresponding net
Frame weak link provides thinking to improve existing power supply rack and expanding the grid structure that adaptation future load increases, can also lead to
The power distribution network power supply capacity under TSC assessment different running method is crossed, the distribution method of operation to formulate safe, reliable, efficient mentions
For guidance.
In the prior art, the capacity-load ratio method more early proposed as a kind of ratio based on controller switching equipment capacity and load come
The method for calculating TSC, this method lack only with simple engineering calculation strategy and consider practical distribution network model, cause to assess
Accuracy is not high.With going deep into for TSC research, researcher gradually considers this key element of Distribution Network Frame, proposes meter and net
Distribution system power supply capacity calculation method, such as peak load method of multiplicity, Network Maximal-flow method of network power supply capacity etc., but should
The practical structures of power distribution network can not be still described in detail in class method, lead to assessment result and physical presence relatively large deviation.
Summary of the invention
The purpose of the present invention is to provide the fast evaluation methods and system of a kind of power distribution network power supply capacity, to solve to assess
As a result the lower problem of accuracy.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of fast evaluation method of power distribution network power supply capacity, comprising the following steps:
S1, the maximum transfer capacity for obtaining feeder line and main transformer, the connection relationship between feeder line and the connection between main transformer are closed
System；
S2, according to the connection relationship between the feeder line of acquisition, determine that at least one feeder line turns supply path；According to obtaining
The connection relationship between the main transformer taken, determines that at least one main transformer turns supply path；Turn supply path according to the feeder line
Turn supply path with main transformer, establishes feeder line and turn for electric matrix；
S3, turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line, establish master
Become and turns for electric matrix；
Main transformer overload verification under the conditions of S4, progress main transformer N-1, if verification passes through, according to the maximum permissible load
Calculate power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, until verification
Pass through.
Optionally, the step S3 is specifically included:
Turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line；
Turned according to N-1 principle and the feeder line for electric matrix, the need that calculating each feed line turns supply path turn for load；
According to the maximum permissible load, maximum transfer capacity for load and main transformer need to be turned, main transformer is established and turn for electric moment
Battle array；
In the step S4 when the verification passes through, further includes: turned to obtain power distribution network for electric matrix according to the main transformer
Turn power supply capacity between main transformer under the conditions of net capability.
Optionally, the connection relationship between the feeder line in the step S1 refers in each feed line and substation station and station is outer
The connection relationship of other feeder lines；Connection relationship in the step S1 between main transformer, refers to according to bar coupler in substation
Main transformer connection relationship determined by the main transformer of connection.
Optionally, in the step S2: turning supply path according to the feeder line and main transformer turns supply path, establish feeder line and turn
For electric matrix, specifically include:
The both ends that main transformer turns supply path are considered as virtual feeder line, supply path and virtual feeder line are turned according to the feeder line,
Feeder line is established to turn for electric matrix；Wherein, element corresponding with the double-end feed that the feeder line turns supply path is denoted as 1, others
Element is denoted as 0.
Optionally, in the step S3: being turned to calculate each feed line most for electric matrix according to N-1 principle and the feeder line
Big permissible load, specifically includes:
S301, turned according to the feeder line for electric matrix, determining and feeder line FiThe feeder line of (i=1,2 ..., NF) connectionAnd feeder line set omegaiFeeder line quantity ni；Wherein, the feeder line FiRefer to any feeder line, the feeder line set omegai
Refer to and the feeder line FiThe logo collection of all feeder lines of connection；
S302, with feeder line FiMeeting N-1 principle is that condition calculates feeder line FiThe first maximum permissible load, with feeder line FiIt is full
FootStill without departing from F after Xiang Qizhuan power supplyiMaximum transfer capacity be condition calculate feeder line FiIt is second maximum allowable
Load；
First maximum permissible load and the second maximum permissible load described in S303, comparison, if the first maximum permissible load is big
In the second maximum permissible load, then using the first maximum permissible load as feeder line FiPractical maximum permissible load, it is on the contrary then will
Second maximum permissible load is as feeder line FiPractical maximum permissible load.
Optionally, first maximum permissible load is denoted as FLi, second maximum permissible load is denoted as FLi j, described
FLiAnd FLi jCalculation formula it is specific as follows:
In formula (1), FSi,maxFor feeder line FiMaximum transfer capacity, FSj,maxFor feeder lineMaximum transmitted hold
Amount；njFor with feeder line FjThe feeder line quantity of connection.
Optionally, in the step S3: turning to calculate each feed line for electric matrix and turn to supply according to N-1 principle and the feeder line
The need of power path turn to specifically include for load:
S311, determine that each feed line turns supply path CmThe head end feeder line of (m=1,2 ..., M)Obtain the head end
Feeder lineMaximum permissible load
S312, according to the head end feeder lineMaximum permissible loadThe each feed line is calculated to turn for circuit
Diameter CmThe need of (m=1,2 ..., M) turn for load CLm,max, calculation formula is specific as follows:
In formula, nsmFor with feeder lineThe feeder line quantity of connection.
Optionally, in the step S3: according to the maximum permissible load, need to turn to hold for the maximum transmitted of load and main transformer
Amount establishes main transformer and turns to specifically include for electric matrix:
Select a main transformer Ti(i=1,2 ..., NT) judges other main transformers T respectivelyj(j ≠ i, j=1,2 ..., NT) with it is described
Main transformer TiTurn supply path with the presence or absence of main transformer；If it is not, then by elements Ai,jIt is denoted as 0, the elements Ai,jTurn to supply for the main transformer
The element of electric matrix；
If so, continuing to judge main transformer TiWith main transformer TjWhether same substation is belonged to, if main transformer TiWith main transformer TjBelong to same
One substation, then main transformer TiWith main transformer TjBetween by stand in bar coupler carry out turn power supply, according to formula (3) calculate described in
Elements Ai,j；If main transformer TiWith main transformer TjIt is not belonging to same substation, then main transformer TiWith main transformer TjBetween by feeder line carry out turn supply
Electricity calculates the A according to formula (4)i,j, the formula (3) and formula (4) be specific as follows:
In formula, ФjFor with main transformer TjThe logo collection of all feeder lines of connection, KjAnd RjRespectively main transformer TjOverload factor
And maximum transfer capacity, Θi,jFor main transformer TiTo the main transformer T of non-same substationjFeeder line when turn power supply turns supply path
Set, FLl,maxFor feeder line FlMaximum permissible load.
Optionally, in the step S3: according to the maximum permissible load, need to turn to hold for the maximum transmitted of load and main transformer
Amount establishes main transformer and turns to specifically include for electric matrix:
The main transformer overload verification under the conditions of feeder line N-1 is carried out, if verification passes through, according to the maximum permissible load, need
Turn the maximum transfer capacity for load and main transformer, establishes main transformer and turn for electric matrix；If verification does not pass through, carry out feeder line N-1's
Main transformer overload correcting process.
The present invention also provides a kind of RES(rapid evaluation system)s of power distribution network power supply capacity, comprising:
Parameter acquiring unit, for obtaining connection relationship and master between the maximum transfer capacity of feeder line and main transformer, feeder line
Connection relationship between change；
Path determining unit determines that at least one feeder line turns for the connection relationship between the feeder line according to acquisition
Supply path；According to the connection relationship between the main transformer of acquisition, determine that at least one main transformer turns supply path；According to described
Feeder line turns supply path and main transformer turns supply path, establishes feeder line and turns for electric matrix；
Computing unit turns to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line,
Main transformer is established to turn for electric matrix；
Verification unit carries out the main transformer overload verification under the conditions of main transformer N-1, if verification passes through, according to described maximum fair
Perhaps carry calculation power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, directly
Pass through to verification；
The parameter acquiring unit, path determining unit, computing unit and verification unit are sequentially connected.
Compared with prior art, the invention has the following advantages:
Method of the invention considers the connection relationship of the power equipments such as power distribution network main transformer and feeder line, can be more completely anti-
The practical network frame topology structural information of power distribution network, and the N-1 principle of effectively meter and feeder line and main transformer are reflected, the power distribution network of acquisition is calculated
Net capability result accuracy is high.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow diagram for the fast evaluation method that the embodiment of the present invention 1 provides.
Fig. 2 is the configuration diagram for the power distribution network that the embodiment of the present invention 3 provides.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
In the description of the present invention, it is to be understood that, term " on ", "lower", "top", "bottom", "inner", "outside" etc. indicate
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the present invention and simplification retouch
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.It should be noted that when a component is considered as " connection " another component,
It can be directly to another component or may be simultaneously present the component being centrally located.
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment 1
The present embodiment 1 provides a kind of fast evaluation method of power distribution network power supply capacity, comprising the following steps:
S1, the maximum transfer capacity for obtaining feeder line and main transformer, the connection relationship between feeder line and the connection between main transformer are closed
System；
S2, according to the connection relationship between the feeder line of acquisition, determine that at least one feeder line turns supply path；According to obtaining
The connection relationship between the main transformer taken, determines that at least one main transformer turns supply path；Turn supply path according to the feeder line
Turn supply path with main transformer, establishes feeder line and turn for electric matrix；
S3, turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line, establish master
Become and turns for electric matrix；
S4, it is verified into the main transformer overload under the conditions of progress main transformer N-1, if verification passes through, according to described maximum allowable negative
Lotus calculates power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, until school
It tests and passes through.
Method of the invention considers the connection relationship of the power equipments such as power distribution network main transformer and feeder line, can be more completely anti-
The practical network frame topology structural information of power distribution network, and the N-1 principle of effectively meter and feeder line and main transformer are reflected, the power distribution network of acquisition is calculated
Net capability result accuracy is high.
In the present embodiment, the step S3 is specifically included:
Turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line；
Turned according to N-1 principle and the feeder line for electric matrix, the need that calculating each feed line turns supply path turn for load；
According to the maximum permissible load, maximum transfer capacity for load and main transformer need to be turned, main transformer is established and turn for electric moment
Battle array；
In the step S4 when the verification passes through, further includes: turned to obtain power distribution network for electric matrix according to the main transformer
Turn power supply capacity between main transformer under the conditions of net capability.
Method of the invention can also calculate and turn between acquisition main transformer while calculating power distribution network net capability
Power supply capacity, calculation process are simple and quick.
In the present embodiment, the connection relationship between feeder line in the step S1, refer in each feed line and substation station and
The connection relationship of other feeder lines outside standing；Connection relationship in the step S1 between main transformer, refers to according to bus contact in substation
Switch main transformer connection relationship determined by the main transformer of connection.
The practical structures of power distribution network are described in detail in method of the invention, can effecting reaction power distribution network frame
Structure information, computational solution precision are higher.
In the present embodiment, in the step S2: turning supply path according to the feeder line and main transformer turns supply path, establish feedback
Line turns to specifically include for electric matrix:
The both ends that main transformer turns supply path are considered as virtual feeder line, supply path and virtual feeder line are turned according to the feeder line,
Feeder line is established to turn for electric matrix；Wherein, element corresponding with the double-end feed that the feeder line turns supply path is denoted as 1, others
Element is denoted as 0.
In the present embodiment, the step S3: turn the maximum transmitted for electric matrix and feeder line according to N-1 principle, the feeder line
Capacity calculates the maximum permissible load of each feed line, specifically includes:
S301, turned according to the feeder line for electric matrix, determining and feeder line FiThe feeder line of (i=1,2 ..., NF) connectionAnd feeder line set omegaiFeeder line quantity ni；Wherein, the feeder line FiRefer to any feeder line, the feeder line set
ΩiRefer to and the feeder line FiThe logo collection of all feeder lines of connection, the NF are main feeder quantity；
S302, with feeder line FiMeeting N-1 principle is that condition calculates feeder line FiThe first maximum permissible load, with feeder line FiIt is full
FootStill without departing from F after Xiang Qizhuan power supplyiMaximum transfer capacity be condition calculate feeder line FiIt is second maximum allowable
Load；
First maximum permissible load and the second maximum permissible load described in S303, comparison, if the first maximum permissible load is big
In the second maximum permissible load, then using the first maximum permissible load as feeder line FiPractical maximum permissible load, it is on the contrary then will
Second maximum permissible load is as feeder line FiPractical maximum permissible load.
Specifically, first maximum permissible load is denoted as FLi, second maximum permissible load is denoted as FLi j, described
FLiAnd FLi jCalculation formula it is specific as follows:
In formula (1), FSi,maxFor feeder line FiMaximum transfer capacity, FSj,maxFor feeder lineMaximum transmitted hold
Amount；njFor with feeder line FjThe feeder line quantity of connection.
Practical maximum permissible load FLi,max, i=1,2 ..., the calculation formula of NF is as follows:
FLi,max=max (FLi,FLi j), i=1,2 ..., NF；j∈Ωi
In the present embodiment, in the step S3: being turned to calculate each feed line for electric matrix according to N-1 principle and the feeder line
The need for turning supply path turn to specifically include for load:
S311, determine that each feed line turns supply path CmThe head end feeder line of (m=1,2 ..., M)Obtain the head end feedback
LineMaximum permissible load
S312, according to the head end feeder lineMaximum permissible loadThe each feed line is calculated to turn for circuit
Diameter CmThe need of (m=1,2 ..., M) turn for load CLm,max, calculation formula is specific as follows:
In formula, nsmFor with feeder lineThe feeder line quantity of connection.
In the present embodiment, in the also included part step S3: according to the maximum permissible load, need to turn for load and
The maximum transfer capacity of main transformer forms main transformer and turns to specifically include for electric matrix:
Select a main transformer Ti(i=1,2 ..., NT) judges other main transformers T respectivelyj(j ≠ i, j=1,2 ..., NT) with it is described
Main transformer TiTurn supply path with the presence or absence of main transformer；If it is not, then by elements Ai,jIt is denoted as 0, the elements Ai,jTurn to supply for the main transformer
The element of electric matrix；Wherein, NT is total main transformer quantity；
If so, continuing to judge main transformer TiWith main transformer TjWhether same substation is belonged to, if main transformer TiWith main transformer TjBelong to same
One substation, then main transformer TiWith main transformer TjBetween by stand in bar coupler carry out turn power supply, according to formula (3) calculate described in
Elements Ai,j；If main transformer TiWith main transformer TjIt is not belonging to same substation, then main transformer TiWith main transformer TjBetween by feeder line carry out turn supply
Electricity calculates the A according to formula (5)i,j, the formula (3) and formula (4) be specific as follows:
In formula, ΦjFor with main transformer TjThe logo collection of all feeder lines of connection, KjAnd RjRespectively main transformer TjOverload factor
And maximum transfer capacity, Θi,jFor main transformer TiTo the main transformer T of non-same substationjFeeder line when turn power supply turns supply path
Set, FLl,maxFor feeder line FlMaximum permissible load.
The above each parameter in the present invention calculates, such as maximum permissible load, need to turn to pertain only to algebra fortune for load etc.
It calculates, calculation process is simple, and computational efficiency is high, so as to quick obtaining power distribution network net capability and can turn power supply capacity.
In the present embodiment, in the also included part step S3: according to the maximum permissible load, need to turn for load and
The maximum transfer capacity of main transformer forms main transformer and turns to specifically include for electric matrix:
The main transformer overload verification under the conditions of feeder line N-1 is carried out, if verification passes through, according to the maximum permissible load, need
Turn the maximum transfer capacity for load and main transformer, forms main transformer and turn for electric matrix；If verification does not pass through, carry out feeder line N-1's
Main transformer overload correcting process.
More specifically, N-1 verification is carried out for each feed line respectively, judges whether each main transformer overloads；If it is not, then basis
The maximum permissible load need to turn maximum transfer capacity for load and main transformer, form main transformer and turn for electric matrix；If so, subtracting
The need that the maximum permissible load of few N-1 feeder line and the feeder line connecting with N-1 feeder line turn supply path turn for load, until main transformer is not
Overload.Wherein, the feeder line of N-1 feeder line fingering row N-1 verification.
In the present embodiment, by carrying out N-1 verification to each feed line, can effectively it count and the N-1 security constraint of feeder line.
In the present embodiment, the step S4 is specifically included:
S41, it is directed to the progress N-1 verification of each main transformer respectively, judges whether it overloads；If nonoverload thens follow the steps
S42, if overload thens follow the steps S43；
S42, power distribution network net capability is calculated according to the maximum permissible load, turns to obtain for electric matrix according to main transformer
Turn power supply capacity between main transformer under the conditions of power distribution network net capability；Wherein, the power supply capacity that turns between main transformer refers to
Main transformer between any two turn power supply capacity；
S43, the overload load according to main transformer, according to the maximum transfer capacity and main feeder of each feed line on the main transformer
The ratio of maximum transfer capacity (the sum of the maximum transfer capacities of all feeder lines), the maximum for reducing respective feed connection on N-1 main transformer are negative
Lotus, until main transformer nonoverload；Wherein, the main transformer of N-1 main transformer fingering row N-1 safety check.
In the present embodiment, the calculation method that can always turn power supply capacity is as follows:
The total of each main transformer turns power supply capacity and turns the sum of power supply capacity between other each main transformers equal to it.
By carrying out N-1 verification to each main transformer, can effectively count and the N-1 security constraint of main transformer.
The invention has the following advantages:
1) connection relationship for considering the power equipments such as power distribution network main transformer, feeder line and bar coupler, can be more completely
The practical network frame topology structural information of reaction reflection power distribution network, and the effectively N-1 security constraint of meter and feeder line and main transformer；
2) it can quickly calculate to obtain and turn power supply capacity between the maximum permissible load of power distribution network, main transformer and can always turn to supply
Capacitance turns power supply capacity situation based on main transformer each under the conditions of TSC, can fast selecting be suitble to turn power supply a path, and
Know that power distribution network turns the weak link of power supply；
3) algebraic operation is pertained only to, calculation process is simple, and computational efficiency is high, can quick obtaining power distribution network net capability
With can turn power supply capacity.
Embodiment 2
The present embodiment 2 provides a kind of RES(rapid evaluation system) of power distribution network power supply capacity, for executing the offer of embodiment 1
Fast evaluation method, the system comprises:
Parameter acquiring unit, for obtaining connection relationship and master between the maximum transfer capacity of feeder line and main transformer, feeder line
Connection relationship between change；
Path determining unit determines that at least one feeder line turns for the connection relationship between the feeder line according to acquisition
Supply path；According to the connection relationship between the main transformer of acquisition, determine that at least one main transformer turns supply path；According to described
Feeder line turns supply path and main transformer turns supply path, establishes feeder line and turns for electric matrix；
Computing unit turns to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line,
Main transformer is established to turn for electric matrix；
Verification unit carries out the main transformer overload verification under the conditions of main transformer N-1, if verification passes through, according to described maximum fair
Perhaps carry calculation power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, directly
Pass through to verification；
The parameter acquiring unit, path determining unit, computing unit and verification unit are sequentially connected.
As described above, parameter acquiring unit calculates single for executing step S1, path determining unit for executing step S2
Member executes step S4 for executing step S3, verification unit.The also included part step S1-4 similarly uses pair in embodiment 1
The unit answered executes, and repeats no more in the present embodiment 2.
Embodiment 3
The present embodiment 3 is of the invention fast to further explain using -30 feeder line power distribution network of 6 main transformer as sample calculation
Fast appraisal procedure, and prove its validity.
The power distribution network contains 3 110kV substations, and each substation contains 2 main transformers, and wherein the capacity of main transformer #1~#4 is
The capacity of 40MVA, main transformer #5 and #6 are 63MVA, and the maximum transfer capacity of every 10kV feeder line is 11.3MVA.Table 1 lists 6
The feeder line and main transformer of -30 feeder line power distribution network of main transformer turn supply path.Table 2 then list feeder line turn for electric matrix TF element,
Middle TF is the matrix of 36 rows and 36 column, and the 1st~30 row (column) indicates feeder line F1~F30, and the 31st~36 row (column) indicates bus connection
Network switchs virtual feeder line B1~B6 of two sides, and table 2 only lists the feeder line that numerical value is 1 and turns power supply matrix element, the square that do not list
The numerical value of array element element is all 0.
The feeder line and main transformer of -30 feeder line power distribution network of 16 main transformer of table turn supply path
Remarks: passing through feeder line without * and with * respectively and main transformer carries out turning power supply, i.e. expression feeder line turns supply path and master
Change turns supply path.
2 feeder line of table turns the element for electric matrix TF
Fast evaluation method of the invention is now applied to -30 feeder line power distribution network of 6 main transformer, in the hope of solution distribution maximum for electric energy
Power.Table 3 lists feeder load situation under the conditions of TSC, and table 4 then lists distribution maximum under the conditions of TSC for electric energy
Power and corresponding main transformer load condition.According to table 3, under the conditions of power distribution network net capability, the method for the present invention is obtained
The feeder load distribution taken is more balanced, and the feeder load regularity of distribution is generally closely related with the feeder line mode of connection.For example,
For the feeder line of " 2-1 " mode of connection, load is generally near 1/2 feeder line capacity, i.e. 5.65MVA；For mutual containing two
Join the feeder line (such as F18, F23 and F28) of feeder line, feeder line capacity of the load close to 2/3, i.e. 7.53MVA.As shown in Table 4, this hair
The distribution net capability of bright method is 171.83MVA.In addition, the method for the present invention is operated based on algebraic operation, independently execute
Program 1000 times, the average each run time is 1.5ms, can quick obtaining TSC and its main transformer and feeder load scheme.
Feeder load situation of the table 3 under the conditions of TSC
Main transformer load condition of the table 4 under the conditions of TSC
Formula (7) is that the main transformer of -30 feeder line power distribution network of 6 main transformer turns for electric matrix.Table 5 has been further listed under the conditions of TSC
Main transformer can turn power supply capacity situation.According to the calculated result of table 5, power distribution network administrative staff can quickly determine that N- occurs for different main transformers
When 1 safety check, it can turn to be supplied to the capacity of the outer interconnection main transformer in station and station, and then determination can always turn power supply capacity.For example, as master
When becoming #1 progress N-1, the load of main transformer #1 can turn to be supplied to main transformer #2, #3, #5 and #6, and can turn power supply capacity and be respectively
11.75MVA, 2.83MVA, 8.48MVA and 5.65MVA, interior and outer main transformer of standing total power supply capacity that turns of standing is 28.70MVA.
Based on the size for turning power supply capacity between different main transformers, can fast selecting be suitble to turn a path for power supply, and obtain
Power distribution network is taken to turn the weak link of power supply.For example, when N-1 occurs for main transformer #4, preferentially by the contact master in its load transfer to station
Become #3, secondly be main transformer #2, be finally main transformer #5 and #6, and can turn power supply capacity be respectively 11.75MVA, 11.30MVA,
3.77MVA and 3.77MVA.Compared with the capacity that can turn to be supplied to main transformer #3 and #2, due to the electrical interconnection of main transformer #4 and #5 and #6
Relationship is weaker, therefore can turn to be supplied to #5 and the capacity of #6 is less.Additionally due to nothing turns supplying channels between main transformer #4 and main transformer #1,
It can not be by load transfer so far two main transformers.
Main transformer of the table 5 under the conditions of TSC can turn power supply capacity
According to table 4, under the conditions of TSC, the load of main transformer #1~#6 be respectively 28.25MVA, 28.25MVA,
26.82MVA, 30.13MVA, 30.13MVA and 28.25MVA.Compared with above-mentioned main transformer load, when N-1 occurs for main transformer #1~#6,
It is respectively 28.70MVA, 28.70MVA, 26.82MVA, 30.58MVA, 53.58MVA and 49.82MVA that power supply capacity, which can always be turned, can
Turn power supply capacity and be no less than main transformer load respectively, is i.e. the TSC scheme of the method for the present invention strictly meets main transformer N-1 security verification and wants
It asks.It should be pointed out that can turn that power supply capacity is equal with the load of main transformer #3, and reason is this calculation when N-1 occurs for main transformer #3
The correcting process for the N-1 main transformer overload that example has carried out main transformer #3 is connected to feeder line F11~F15's of main transformer #3 before amendment
Load is all 5.65MVA, and N-1 occurs for main transformer #3 need to turn the load supplied to be 28.25MVA at this time, and having exceeded maximum can turn for capacitor
Therefore the amount of unbalance 1.43MVA of the two is shared out equally to F11~F15, finally obtains revised feedback by amount 26.82MVA
Specific electric load 5.36MVA.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of fast evaluation method of power distribution network power supply capacity, which comprises the following steps:
S1, the maximum transfer capacity for obtaining feeder line and main transformer, the connection relationship between feeder line and the connection relationship between main transformer；
S2, according to the connection relationship between the feeder line of acquisition, determine that at least one feeder line turns supply path；According to acquisition
Connection relationship between the main transformer determines that at least one main transformer turns supply path；Turn supply path and master according to the feeder line
Change turns supply path, establishes feeder line and turns for electric matrix；
S3, turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line, establish main transformer and turn
For electric matrix；
Main transformer overload verification under the conditions of S4, progress main transformer N-1 calculates if verification passes through according to the maximum permissible load
Power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, until verification passes through.
2. a kind of fast evaluation method of power distribution network power supply capacity according to claim 1, which is characterized in that the step
S3 is specifically included:
Turned to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line；
Turned according to N-1 principle and the feeder line for electric matrix, the need that calculating each feed line turns supply path turn for load；
According to the maximum permissible load, maximum transfer capacity for load and main transformer need to be turned, main transformer is established and turn for electric matrix；
In the step S4 when the verification passes through, further includes: turned to obtain power distribution network maximum for electric matrix according to the main transformer
Turn power supply capacity between main transformer under the conditions of power supply capacity.
3. a kind of fast evaluation method of power distribution network power supply capacity according to claim 1, which is characterized in that the step
The connection relationship between feeder line in S1 refers to the connection relationships of each feed line with other outer feeder lines of in substation station and station；It is described
Connection relationship in step S1 between main transformer refers to that main transformer determined by the main transformer connected according to bar coupler in substation connects
Connect relationship.
4. a kind of fast evaluation method of power distribution network power supply capacity according to claim 1, which is characterized in that the step
In S2: supply path is turned according to the feeder line and main transformer turns supply path, feeder line is established and turns to specifically include for electric matrix:
The both ends that main transformer turns supply path are considered as virtual feeder line, supply path and virtual feeder line are turned according to the feeder line, are established
Feeder line turns for electric matrix；Wherein, element corresponding with the double-end feed that the feeder line turns supply path is denoted as 1, other elements
It is denoted as 0.
5. a kind of fast evaluation method of power distribution network power supply capacity according to claim 1, which is characterized in that the step
In S3: turn to calculate the maximum permissible load of each feed line for electric matrix, specifically include according to N-1 principle and the feeder line:
S301, turned according to the feeder line for electric matrix, determining and feeder line FiThe feeder line of (i=1,2 ..., NF) connection
And feeder line set omegaiFeeder line quantity ni；Wherein, the feeder line FiRefer to any feeder line, the feeder line set omegaiRefer to it is described
Feeder line FiThe logo collection of all feeder lines of connection；
S302, with feeder line FiMeeting N-1 principle is that condition calculates feeder line FiThe first maximum permissible load, with feeder line FiMeetStill without departing from F after Xiang Qizhuan power supplyiMaximum transfer capacity be condition calculate feeder line FiIt is second maximum allowable negative
Lotus；
First maximum permissible load and the second maximum permissible load described in S303, comparison, if the first maximum permissible load is greater than the
Two maximum permissible loads, then using the first maximum permissible load as feeder line FiPractical maximum permissible load, it is on the contrary then by second
Maximum permissible load is as feeder line FiPractical maximum permissible load.
6. a kind of fast evaluation method of power distribution network power supply capacity according to claim 5, which is characterized in that described first
Maximum permissible load is denoted as FLi, second maximum permissible load is denoted asThe FLiWithCalculation formula it is specific
It is as follows:
In formula (1), FSi,maxFor feeder line FiMaximum transfer capacity, FSj,maxFor feeder lineMaximum transfer capacity；nj
For with feeder line FjThe feeder line quantity of connection.
7. a kind of fast evaluation method of power distribution network power supply capacity according to claim 2, which is characterized in that the step
In S3: being turned according to N-1 principle and the feeder line for electric matrix, the need that calculating each feed line turns supply path turn for load, specifically
Include:
S311, determine that each feed line turns supply path CmThe head end feeder line of (m=1,2 ..., M)Obtain the head end feeder lineMaximum permissible load
S312, according to the head end feeder lineMaximum permissible loadIt calculates each feed line and turns supply path Cm
The need of (m=1,2 ..., M) turn for load CLm,max, calculation formula is specific as follows:
In formula, nsmFor with feeder lineThe feeder line quantity of connection.
8. a kind of fast evaluation method of power distribution network power supply capacity according to claim 2, which is characterized in that the step
In S3: according to the maximum permissible load, maximum transfer capacity for load and main transformer need to be turned, main transformer is established and turn for electric matrix,
It specifically includes:
Select a main transformer Ti(i=1,2 ..., NT) judges other main transformers T respectivelyj(j ≠ i, j=1,2 ..., NT) and the main transformer
TiTurn supply path with the presence or absence of main transformer；If it is not, then by elements Ai,jIt is denoted as 0, the elements Ai,jTurn for the main transformer for electric moment
The element of battle array；
If so, continuing to judge main transformer TiWith main transformer TjWhether same substation is belonged to, if main transformer TiWith main transformer TjBelong to same change
Power station, then main transformer TiWith main transformer TjBetween carry out turning power supply by bar coupler in standing, calculate the element according to formula (3)
Ai,j；If main transformer TiWith main transformer TjIt is not belonging to same substation, then main transformer TiWith main transformer TjBetween by feeder line carry out turn power supply, root
The A is calculated according to formula (4)i,j, the formula (3) and formula (4) be specific as follows:
In formula, ΦjFor with main transformer TjThe logo collection of all feeder lines of connection, KjAnd RjRespectively main transformer TjOverload factor and most
Big transmission capacity, Θi,jFor main transformer TiTo the main transformer T of non-same substationjFeeder line when turn power supply turns supply path set,
FLl,maxFor feeder line FlMaximum permissible load.
9. a kind of fast evaluation method of power distribution network power supply capacity according to claim 2, which is characterized in that the step
In S3: according to the maximum permissible load, maximum transfer capacity for load and main transformer need to be turned, main transformer is established and turn for electric matrix,
It specifically includes:
The main transformer overload verification under the conditions of feeder line N-1 is carried out, passes through if verifying, according to the maximum permissible load, need to turn to supply
The maximum transfer capacity of load and main transformer is established main transformer and is turned for electric matrix；If verification does not pass through, the main transformer of feeder line N-1 is carried out
Overload correcting process.
10. a kind of RES(rapid evaluation system) of power distribution network power supply capacity characterized by comprising
Parameter acquiring unit, for obtain connection relationship between the maximum transfer capacity of feeder line and main transformer, feeder line and main transformer it
Between connection relationship；
Path determining unit determines that at least one feeder line turns power supply for the connection relationship between the feeder line according to acquisition
Path；According to the connection relationship between the main transformer of acquisition, determine that at least one main transformer turns supply path；According to the feeder line
Turn supply path and main transformer turns supply path, establishes feeder line and turn for electric matrix；
Computing unit turns to calculate the maximum permissible load of each feed line for electric matrix according to N-1 principle and the feeder line, establish
Main transformer turns for electric matrix；
Verification unit carries out the main transformer overload verification under the conditions of main transformer N-1, if verification passes through, according to described maximum allowable negative
Lotus calculates power distribution network net capability；If verification does not pass through, the main transformer overload correcting process of main transformer N-1 is carried out, until school
It tests and passes through；
The parameter acquiring unit, path determining unit, computing unit and verification unit are sequentially connected.
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| CN113409007A (en) * | 2021-05-28 | 2021-09-17 | 广东电网有限责任公司 | Automatic analysis system and method for feeder line-to-power supply scene |
| CN115441448A (en) * | 2022-11-08 | 2022-12-06 | 南方电网数字电网研究院有限公司 | Power conversion and supply verification method, device and equipment for power distribution network line and storage medium |
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